Kafe2

* Removed the dependency on `scipy.misc.derivative` which is being removed with SciPy v1.12.0. Instead, numdifftools (which is already a kafe2 dependency anyway) is used (b221b577e92abef3f2430eb5b35604239dc1068c)
* At least two significant digits for CL annotations in the Contour Profiler are shown (265685a5f29927b740cab50c21b0998b42440b13)
* Fixed example 004 data generation (7e57077f7fb0e486e2a3d5a0aa2cfc67ff9ba2e4)
* Added initial documentation of the Contour Profiler (2a4d7174eadd97504a1c9c5e2d7f19c73e9af95c and d3cfb140b90a66c05ff5b111732abd714bd41906)

**Full Changelog**: https://github.com/PhiLFitters/kafe2/compare/v2.9.0...v2.10.0-pre1

Fixed a crash when plotting the error band when at least one parameter is fixed.

- Fixed 241 (Different behavior depending on parameter names in model)

Fixed a problem with fix parameters in Iminuit which was described in 240